Oracle Linux 6 DVDs Now Available
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On Sunday 6 February 2011, Oracle Linux 6 was released on the Unbreakable Linux Network for customers with an Oracle Linux support subscription. Shortly after that, the Oracle Linux 6 RPMs were made available on ourpublic yum server. Today we published the installation DVD images onedelivery.oracle.com/linux. Oracle Linux 6 is free to download, install and use. The full release notes arehere, but similar to my recent post about Oracle Linux 5.6, I wanted to highlight a few items about this release.
Unbreakable Enterprise Kernel
As is the case with Oracle Linux 5.6, the default installed kernel on x86_64 platform in Oracle Linux 6 is theUnbreakable Enterprise Kernel. If you haven't already, I highly recommend youwatch the replay of this webcast by Chris Mason on the performance improvements made in this kernel.
# uname -r 2.6.32-100.28.5.el6.x86_64
The Unbreakable Enterprise Kernel is delivered via the package kernel-uek:
[root@localhost ~]# yum info kernel-uek ... Installed Packages Name : kernel-uek Arch : x86_64 Version : 2.6.32 Release : 100.28.5.el6 Size : 84 M Repo : installed From repo : anaconda-OracleLinuxServer-201102031546.x86_64 Summary : The Linux kernel URL : http://www.kernel.org/ License : GPLv2 Description: The kernel package contains the Linux kernel (vmlinuz), the core of : any Linux operating system. The kernel handles the basic functions : of the operating system: memory allocation, process allocation, : device input and output, etc.
ext4 file system
The ext4 or fourth extended filesystem replaces ext3 as the default filesystem in Oracle Linux 6.
# mount /dev/mapper/VolGroup-lv_root on / type ext4 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0") /dev/sda1 on /boot type ext4 (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
Red Hat compatible kernel
Oracle Linux 6 also includes a Red Hat compatible kernel built directly from RHEL source. It's already installed, so booting it is a matter of editing /etc/grub.conf
# rpm -qa | grep kernel-2.6.32 kernel-2.6.32-71.el6.x86_64
Oracle Linux 6 no longer includes a Red Hat compatible kernel with Oracle bug fixes. The only Red Hat compatible kernel included is the one built directly from RHEL source.
Yum-only access to Unbreakable Linux Network (ULN)
Oracle Linux 6 uses yum exclusively for access to Unbreakable Linux Network. To register your system withULN, use the following command:
# uln_register
No Itanium Support
Oracle Linux 6 is not supported on the Itanium (ia64) platform.
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近日,Oracle发布了Oracle Linux 6版本,在 Unbreakable Linux Network上显示的日期是2011年2月11日,现在这个版本已经可以下载,按照Oracle的一贯说法,这一版本可以 " free to download, install and use",其版本信息参考here。
该发布的内核版本是2.6.32,缺省使用Ext4文件系统,从Wiki百科摘录以下Ext4的特性:
ext4(第四扩展文件系统)文件系统是Linux系统下的日志文件系统,是ext3文件系统的后继版本。
ext4 原始的开发目标是一系列的向下兼容ext3、移除其64位限制与提升其效能的延伸包[1]。然而,某些Linux开发者因稳定性原因而拒绝将这些延伸包应用在ext3上,并要求其作为ext3的分支,改名为ext4并另行开发,以免影响到目前的ext3用户。该要求被接受以后,ext3维护者 Theodore Ts'o在2006年6月28日公开了ext4的开发计划。
ext4文件系统可支持最高1 Exbibyte的分区区与最大16 Tebibyte的文件
Ext4另外一个引人的变化是引入了Extent的文件存储方式,这一概念和Oracle中的Extent概念非常相似了:
ext4 引进了Extent文件存储方式,以取代ext2/3使用的block mapping方式。Extent指的是一连串的连续实体block,这种方式可以增加大型文件的效率并减少分裂文件。ext4支持的单一Extent,在单一block为4KB的系统中最高可达128MB。单一inode中可存储4笔Extent;超过四笔的Extent会以Htree方式被索引。
新部署的系统完全有必要来体验一下Oracle Linux 6的内核了,也可以利用一下Oracle Public YUM Server!
-The End-
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